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The circuit has resistors of equal resis...

The circuit has resistors of equal resistance R. The equivalent resistance between A and B, when key is closed is `R_1` and when key is open is `R_2`. Find the ratio `R_1 and R_2` .

A

`11//12`

B

`2//5`

C

`1//5`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
b. A careful observation will reveal that one end of each resistor is
connected to A and the other end of each resistor is connected
to B. Hence, resistors are in parallel.
`R_(eq) = R//5`
When the key is open, current will pass through resistance 1
and 2 only, which are in parallel. `R_(eq) = R//2`
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